Here below a list of the original Flybacks LOPTS of many CRT TVs.
These DC flybacks are found in every CRT computer monitor and are called
the DST flybacks (diode-split transformers) because of the several high
voltage diodes and secondaries inside. In addition to the high
resistance resistor cascade (Bleeder) and focus/screen tuning
potentiometers described above, these kinds may have an integrated high
voltage filtering capacitor (few nanofarads at >=30 kV), or –
optionally – a HV capacitor for dynamic focus.The TV DC flybacks are also diode-split (DST), however these are found in every modern CRT TV-set from mid-end 80s and onwards. These have just two screen-tuning potentiometers and no internal capacitors whatsoever !ISTRUCTIONS: To search a specific item within this page use the search function of your browser.
| Original Reference | HR |
| K 1228 | HR 16514 |
| KA 12-13 | HR 1662 |
| KA 12/520 | HR 1662 |
| KA 6/500 | HR 1662 |
| KF 2825 G | HR 42019 |
| KF 48120 A | HR 46043 |
| KF 48193 P | HR 7858 |
| KF 58334 D | HR 8337 |
| KF 58383 P | HR 8258 |
| KF 58390 P | HR 8246 |
| KF 58395 S | HR 7497 |
| KF 74163 S | HR 7675 |
| KF 7452 S | HR 6470 |
| KF 7476 C | HR 8084 |
| KF 9503 C | HR 7664 |
| KF 960506 | HR 7444 |
| KFJ 9238 A | HR 46141 |
| KFJ 9303 C | HR 7664 |
| KFJ 9320 C | HR 7664 |
| KFJ 9503 C | HR 7664 |
| KFS 20867 | HR 42020 |
| KFS 20989 | HR 2287 T12 |
| KFS 21504 B | HR 42009 |
| KFS 48120 A | HR 46043 |
| KFS 60224 B | HR 46043 |
| KFS 60224 B 15 | HR 46043 |
| KFS 60226 | HR 7455 |
| KFS 60226 B | HR 7494 |
| KFS 60229 | HR 8147 |
| KFS 60266 | HR 7468 |
| KFS 60266 B | HR 7468 |
| KFS 60280 | HR 7767 |
| KFS 60282 | HR 7679 |
| KFS 60283 C | HR 7459 |
| KFS 60288 | HR 7474 |
| KFS 60289 | HR 7474 |
| KFS 60291 | HR 8508 |
| KFS 60348 B | HR 7457 |
| KFS 60348 S | HR 7457 |
| KFS 60353 | HR 7747 |
| KFS 60371 | HR 7437 |
| KFS 60371 A | HR 7648 |
| KFS 60371 B | HR 7437 |
| KFS 60371 C | HR 7437 |
| KFS 60371 D | HR 7437 |
| KFS 60391 | HR 7435 |
| KFS 60455 A | HR 7690 |
| KFS 60455 B | HR 7690 |
| KFS 60455 C | HR 7434 |
| KFS 60455 E | HR 7434 |
| KFS 60490 | HR 8562 |
| KFS 60490 A | HR 8562 |
| KFS 60505 | HR 7463 |
| KFS 60505 A | HR 7463 |
| KFS 60506 | HR 7609 |
| KFS 60506 A | HR 7444 |
| KFS 60506 B | HR 7609 |
| KFS 60534 A | HR 7433 |
| KFS 60534 B | HR 7433 |
| KFS 60559 | HR 46045 |
| KFS 60581 B | HR 7439 |
| KFS 60581 C | HR 7439 |
| KFS 60636 | HR 8349 |
| KFS 60636 D | HR 8349 |
| KFS 60676 | HR 7736 |
| KFS 60676 A | HR 7736 |
| KFS 60711 | HR 46198 |
| KFS 60711 A | HR 46198 |
| KFS 60717 | HR 8178 |
| KFS 60769 | HR 7605 |
| KFS 60802 | HR 7475 |
| KFS 60807 A | HR 7695 |
| KFS 60823 C | HR 7459 |
| KFS 60832 | HR 7246 |
| KFS 60844 | HR 7998 |
| KFS 60844 A | HR 7998 |
| KFS 60847 | HR 7929 |
| KFS 60847 A | HR 7929 |
| KFS 60854 | HR 7695 |
| KFS 60893 | HR 7608 |
| KFS 60893 B | HR 7608 |
| KFS 60899 | HR 7750 |
| KFS 60909 | HR 7217 |
| KFS 60909 A | HR 7217 |
| KFS 61043 | HR 7199 |
| KFS 61088 | HR 46217 |
| KFS 61107 | HR 46140 |
| KFS 61107 A | HR 46140 |
| KFS 61140 | HR 7708 |
| KFS 61140 A | HR 7708 |
| KFS 61164 | HR 7985 |
| KFS 61189 | HR 7995 |
| KFS 61202 | HR 46100 |
| KFS 61202 A | HR 46100 |
| KFS 61240 | HR 7695 |
| KFS 61244 | HR 46195 |
| KFS 61254 | HR 7695 |
| KFS 61262 | HR 7468 |
| KFS 61410 | HR 46172 |
| KFS 61424 | HR 8177 |
| KFS 61424 A | HR 8177 |
| KFS 61485 | HR 46213 |
| KFS 61513 | HR 46205 |
| KFS 61513 A | HR 46205 |
| KFS 61513 C | HR 46205 |
| KFT 2 AB 095 F | HR 8750 |
| KFT 2 AB 118 F | HR 8513 |
| KFT 2 AB 119 F | HR 8513 |
| KFT 2 AB 281 F | HR 8836 |
| KFT 2 AB 281 F1 | HR 8836 |
| KFT 3 AB 054 F | HR 8473 |
| KFT 3 AB 096 | HR 8750 |
| KFT 3 AB 096 F | HR 8750 |
| KFT 3 AB 096 FK | HR 8750 |
| KFT 3 AB 119 F | HR 8819 |
| KFT 3 AB 119 F1 | HR 8819 |
| KFT 3 AB 280 F | HR 8750 |
| KFT 3 AB 280 F 1 | HR 8750 |
| KFT 4 AA 028 F | HR 8842 |
| KFT 4 AA 098 F | HR 8591 |
| KFT 4 AA 271 X | HR 8483 |
| KFT 4 AA 348 F | HR 8837 |
| KFT 4 AA 348 F2 | HR 8837 |
| KFT 4 AB 005 | HR 8322 |
| KFT 4 AB 005 PMP | HR 8322 |
| KFT 4 AB 055 F | HR 8429 |
| KFT 4 AB 143 F | HR 8822 |
| KJF 9238 A | HR 46141 |
| KJF 9303 C | HR 7664 |
| KJF 9320 C | HR 7664 |
| KJF 9503 C | HR 7664 |
| KON 30000206 | HR 8447 |
| KR 347 54 | HR 2267 |
| KR 359 75 | HR 2265 |
| KST 806 Y 0 | HRT 507 |
| KST 806 Z 0 | HRT 507 |
| KT 10 | HRT 202 |
| KT 10 D 8 | HRT 202 |
| KT 10 T 0 | HRT 202 |
| KT 10.001 | HR 7618 |
| KT 10.002 | HR 7616 |
| KT 10.003 | HR 7879 |
| KT 101 | HRT 202 |
| KT 101 T 0 | HRT 202 |
| KT 11.000 | HR 8108 |
| KT 11.001 | HR 8098 |
| KT 11.002 | HR 7986 |
| KT 11.003 | HR 8097 |
| KT 11.004 | HR 8565 |
| KT 11.006 | HR 8783 |
| KT 12.000 | HR 8606 |
| KT 12.001 | HR 8266 |
| KT 12.002 | HR 8262 |
| KT 12.003 | HR 8761 |
| KT 12.004 | HR 7667 |
| KT 12.006 | HR 8213 |
| KT 13.000 | HR 8394 |
| KT 13.001 | HR 8254 |
| KT 13.002 | HR 8256 |
| KT 14.000 | HR 7740 |
| KT 14.002 | HR 7713 |
| KT 14.005 | HR 8458 |
| KT 15.000 | HR 8783 |
| KT 15.003 | HR 8466 |
| KT 1895-641 WO | HRT 507 |
| KT 1897-641-0 | HRT 245 BS |
| KT 1897-641-000 | HRT 245 BS |
| KT 1897-641-2 | HRT 245 BS |
| KT 1897-641-3 | HRT 240 BS |
| KT 1897-641-300 | HRT 240 BS |
| KT 19.000 | HR 7117 |
| KT 19.001 | HR 6500 |
| KT 20.000 | HR 7708 |
| KT 20.001 | HR 46089 |
| KT 20.004 | HR 46167 |
| KT 20.006 | HR 46126 |
| KT 20.007 | HR 46117 |
| KT 20.008 | HR 8189 |
| KT 20.009 | HR 46148 |
| KT 20.010 | HR 46127 |
| KT 20.012 | HR 46153 |
| KT 2000-641-... | HRT 209 |
| KT 2000-641-005 | HRT 209 |
| KT 2000-641-006 | HRT 209 |
| KT 2001 | HR 7662 |
| KT 2002 | HR 7649 |
| KT 2003 | HR 7259 |
| KT 2004 | HR 8257 |
| KT 2005 | HR 7662 |
| KT 2006 | HR 7660 |
| KT 2007 | HR 7659 |
| KT 2008 | HR 7650 |
| KT 2009 | HR 7662 |
| KT 2010 | HR 7662 |
| KT 2011 | HR 7962 |
| KT 2012 | HR 7963 |
| KT 2013 | HR 8252 |
| KT 2014 | HR 8255 |
| KT 2015 | HR 8240 |
| KT 2016 | HR 8233 |
| KT 205 | HRT 202 |
| KT 205 T 0 | HRT 202 |
| KT 206 | HRT 203 |
| KT 206 D 6 | HRT 203 |
| KT 206 S 1 | HRT 203 |
| KT 206 T 0 | HRT 203 |
| KT 206 T 1 | HRT 203 |
| KT 206 TO | HRT 203 |
| KT 206-51 | HRT 203 |
| KT 2096-641 | HRT 210 BF |
| KT 2096-641-000 | HRT 210 BF |
| KT 2097-641-0.. | HRT 222 BS |
| KT 2097-641-000 | HRT 222 BS |
| KT 2097-641-1.. | HRT 222 BS |
| KT 2097-641-100 | HRT 222 BS |
| KT 2097-641-2.. | HRT 222 BS |
| KT 2097-641-200 | HRT 222 BS |
| KT 2097-641-3.. | HRT 226 BS |
| KT 2097-641-321 | HRT 226 BS |
| KT 2097-641-345 | HRT 226 BS |
| KT 2097-642-0.. | HRT 225 BP |
| KT 2097-642-004 | HRT 225 BP |
| KT 2097-642-008 | HRT 225 BP |
| KT 2097-642-1.. | HRT 225 BP |
| KT 2097-642-2.. | HRT 225 BP |
| KT 2097-642-3.. | HRT 227 BP |
| KT 2097-642-307 | HRT 230 BP |
| KT 2097-642-308 | HRT 230 BP |
| KT 2097-642-310 | HRT 230 BP |
| KT 2097-642-311 | HRT 230 BP |
| KT 2097-642-314 | HRT 231 BP |
| KT 2097-642-317 | HRT 230 BP |
| KT 2097-642-321 | HRT 230 BP |
| KT 2097-642-323 | HRT 227 BP |
| KT 2097-642-328 | HRT 227 BP |
| KT 2097-642-329 | HRT 230 BP |
| KT 2097-642-338 | HRT 227 BP |
| KT 2097-642-364 | HRT 227 BP |
| KT 2097-642-366 | HRT 227 BP |
| KT 2097-642-368 | HRT 227 BP |
| KT 2097-642-380 | HRT 227 BP |
| KT 21 | HRT 202 |
| KT 21 T 0 | HRT 202 |
| KT 21 TO | HRT 202 |
| KT 211 | HRT 202 |
| KT 211 UO | HRT 203 |
| KT 3001 | HR 7166 |
| KT 3002 | HR 7164 |
| KT 3003 | HR 6383 |
| KT 3004 | HR 8109 |
| KT 3005 | HR 8110 |
| KT 3006 | HR 8112 |
| KT 3007 | HR 8113 |
| KT 3009 | HR 8111 |
| KT 3010 | HR 8115 |
| KT 3011 | HR 8114 |
| KT 3012 | HR 7484 |
| KT 3013 | HR 8468 |
| KT 3014 | HR 8845 |
| KT 306 | HRT 203 |
| KT 306 T 0 | HRT 203 |
| KT 306 TO | HRT 203 |
| KT 4002 | HR 7656 |
| KT 4003 | HR 7802 |
| KT 4004 | HR 7656 |
| KT 5001 | HR 7313 |
| KT 5002 | HR 7310 |
| KT 5003 | HR 8239 |
| KT 5004 | HR 7535 |
| KT 5005 | HR 7484 |
| KT 5006 | HR 8163 |
| KT 5100 | HR 8268 |
| KT 6001 | HR 7888 |
| KT 6002 | HR 7888 |
| KT 6003 | HR 7892 |
| KT 6004 | HR 8099 |
| KT 6005 | HR 7890 |
| KT 6006 | HR 7468 |
| KT 6007 | HR 7494 |
| KT 6008 | HR 7890 |
| KT 6009 | HR 7887 |
| KT 6010 | HR 8103 |
| KT 6011 | HR 7889 |
| KT 6012 | HR 8101 |
| KT 6013 | HR 8102 |
| KT 6014 | HR 8104 |
| KT 6015 | HR 8106 |
| KT 6016 | HR 7468 |
| KT 6017 | HR 8295 |
| KT 6018 | HR 7456 |
| KT 6019 | HR 7879 |
| KT 6020 | HR 8283 |
| KT 6021 | HR 8261 |
| KT 6022 | HR 8105 |
| KT 6023 | HR 7891 |
| KT 6024 | HR 8606 |
| KT 6026 | HR 7879 |
| KT 6027 | HR 8778 |
| KT 6100 | HR 8270 |
| KT 6101 | HR 8267 |
| KT 6103 | HR 8297 |
| KT 7001 | HR 7455 |
| KT 7002 | HR 7094 |
| KT 7003 | HR 7787 |
| KT 7004 | HR 7455 |
| KT 7005 | HR 7468 |
| KT 7006 | HR 7984 |
| KT 7007 | HR 7608 |
| KT 7008 | HR 7737 |
| KT 7009 | HR 7484 |
| KT 7010 | HR 7083 |
| KT 7011 | HR 7254 |
| KT 7012 | HR 7455 |
| KT 7013 | HR 7468 |
| KT 7014 | HR 8303 |
| KT 7016 | HR 7443 |
| KT 7019 | HR 8163 |
| KT 8001 | HR 7841 |
| KT 8002 | HR 6645 |
| KT 8003 | HR 6642 |
| KT 806 T 0 | HRT 507 |
| KT 806 TO | HRT 507 |
| KT 9001 | HR 6364 |
| KT 9002 | HR 6131 |
| KT 9003 | HR 6363 |
| KT 9004 | HR 6384 |
| KT 9005 | HR 6266 |
| KT 9006 | HR 6266 |
| KT 9008 | HR 8142 |
| KT 9009 | HR 8143 |
| KT 9010 | HR 8142 |
| KT 9014 | HR 8642 |
| KT 9019 | HR 8435 |
| KT 9020 | HR 8432 |
| KT 9021 | HR 8310 |
| KTB 805 FR 33 | HRT 242 BP |
| KTB 806 FR 33 | HRT 242 BP |
| KTB 806 MO FR 30 | HRT 242 BP |
| KTB 806 NO FR 30 | HRT 242 BP |
| KTB 806 O-FR-O | HRT 245 BS |
| KTB 806 PO FR 30 | HRT 242 BP |
| KTB 806 PO FR 30/7 | HRT 241 BP |
| KTB 806 PO FR 33 | HRT 242 BP |
| KTB 806 PO FR 337 | HRT 225 BP |
| KTB 806 TO | HRT 218 B |
| KTB 806 TO FR 0 | HRT 245 BS |
| KTB 806 TO FR 30 | HRT 242 BP |
| KTB 806 TO 18 | HRT 218 B |
| KTB 806 TO 18 FR | HRT 242 BP |
| KTB 806 TO-FR-O | HRT 218 B |
| KTB 806 WO | HRT 241 BP |
| KTB 806 WO 22 | HRT 242 BP |
| KTB 806 XO | HRT 245 BS |
| KTP 806 TO | HRT 245 BS |
| KTP 806 TO FR 0 | HRT 245 BS |
| KTP 806 TO 18 | HRT 245 BS |
| KTP 806 XO | HRT 245 BS |
| KTS 801 T 1 FR 56 L | HRT 508 P |
| KTS 805 | HRT 205 |
| KTS 805 FR | HRT 505 P |
| KTS 805 FR 56 L | HRT 205 P |
| KTS 805 FR 56 L+R | HRT 205 P |
| KTS 805 FR 56 R | HRT 205 P |
| KTS 805 TO | HRT 205 |
| KTS 805 TO FR 56 L | HRT 205 P |
| KTS 805 TO FR 56 R | HRT 508 PD |
| KTS 805 TO FR 68L7 | HRT 508 P |
| KTS 805 VO | HRT 205 |
| KTS 806 | HRT 507 |
| KTS 806 EO | HRT 216 A |
| KTS 806 FR 56 | HRT 216 P |
| KTS 806 FR 56 L | HRT 216 P |
| KTS 806 FR 56 R | HRT 216 P |
| KTS 806 MO FR 30 | HRT 242 BP |
| KTS 806 NO | HRT 507 |
| KTS 806 PO FR 30 | HRT 242 BP |
| KTS 806 T 1 | HRT 507 |
| KTS 806 T 1 FR 56 L | HRT 216 P |
| KTS 806 T 1 FR 56 R | HRT 216 PD |
| KTS 806 T 2 FR 75 L | HRT 508 P |
| KTS 806 TL | HRT 507 |
| KTS 806 TO | HRT 216 A |
| KTS 806 TO FR 18 | HRT 242 BP |
| KTS 806 TO FR 30 | HRT 242 BP |
| KTS 806 TO FR 56 L | HRT 508 P |
| KTS 806 TO FR 56 R | HRT 508 PD |
| KTS 806 TO FR 68L7 | HRT 508 P |
| KTS 806 T1 | HRT 507 |
| KTS 806 T1 FR 56 L | HRT 216 P |
| KTS 806 T1 FR 56 R | HRT 216 PD |
| KTS 806 T2 | HRT 507 |
| KTS 806 T2 FR L | HRT 216 P |
| KTS 806 T2 FR 75 L | HRT 508 P |
| KTS 806 VO | HRT 507 |
| KTS 806 WO | HRT 507 |
| KTS 806 WO 22 | HRT 242 BP |
| KTS 806 XO | HRT 507 |
| KTS 806 YO | HRT 507 |
| KTS 806 ZO | HRT 216 B |
| KV 301 | HRT 201 |
| KV 301 R | HRT 201 |
| KV 302 | HRT 201 |
| KV 302 R | HRT 201 |
| KY 03 310 | HR 3213 |
| KY 033 10 | HR 3213 |
D002/37 KAPSCH HR 6062
D002/37 META HR 6062
D002/37 NOKIA - ITT HR 6062
D002/37 SOLAVOX HR 6062
D002/37 TASHIKO HR 6062
D003/37 FERGUSON-THORN-EMI HR 6003
D003/37 GRAETZ HR 6003
D003/37 INGELEN HR 6003
D003/37 INTERFUNK HR 6003
D003/37 META HR 6003
D003/37 NOKIA - ITT HR 6003
D003/37 SOLAVOX HR 6003
D004/37 GELOSO HR 6005
D004/37 GRAETZ HR 6005
D004/37 GRANADA HR 6005
D004/37 INGELEN HR 6005
D004/37 INTERFUNK HR 6005
D004/37 META HR 6005
D004/37 NOKIA - ITT HR 6005
D004/37 SCHAUB-LORENZ HR 6005
D004/37 SCHNEIDER HR 6005
D004/37 SOLAVOX HR 6005
D005/37 GRAETZ HR 6045
D005/37 NOKIA - ITT HR 6045
D012/37 FERGUSON-THORN-EMI HR 6032
D012/37 GRAETZ HR 6032
D012/37 INGELEN HR 6032
D012/37 INTERFUNK HR 6032
D012/37 NOKIA - ITT HR 6032
D012/37 SCHAUB-LORENZ HR 6032
D012/37 SOLAVOX HR 6032
D014/37 GRAETZ HR 6180
D014/37 NOKIA - ITT HR 6180
D016/37 FERGUSON-THORN-EMI HR 6145
D016/37 GRAETZ HR 6145
D016/37 INGELEN HR 6145
D016/37 INTERFUNK HR 6145
D016/37 NOKIA - ITT HR 6145
D022/37 SOLAVOX HR 6062
D023/37 GRAETZ HR 6158
D023/37 INGELEN HR 6158
D023/37 INTERFUNK HR 6158
D023/37 NOKIA - ITT HR 6158
D026/37 AKAI HR 6179
D026/37 NOKIA - ITT HR 6179
D030/37 NOKIA - ITT HR 6182
D032/37 DREAN HR 6154
D032/37 GRAETZ HR 6154
D032/37 INGELEN HR 6154
D032/37 INTERFUNK HR 6154
D032/37 NOKIA - ITT HR 6154
D032/37 SOLAVOX HR 6154
D032/37 TASHIKO HR 6154
D036/37 DREAN HR 6089
D036/37 FERGUSON-THORN-EMI HR 6089
D036/37 GRAETZ HR 6089
D036/37 INTERFUNK HR 6089
D036/37 META HR 6089
D036/37 NOKIA - ITT HR 6089
D036/37 SOLAVOX HR 6089
D036/37 TASHIKO HR 6089
D041/37 LOEWE / LOEWE-OPTA HR 6058
D041/37 NOKIA - ITT HR 6058
D046/37 GRAETZ HR 6113
D046/37 INGELEN HR 6113
D046/37 INTERFUNK HR 6113
D046/37 LUXOR HR 6113
D046/37 NOKIA - ITT HR 6113
D046/37 QUELLE HR 6113
D046/37 SALORA HR 6113
D047/37 FERGUSON-THORN-EMI HR 6144
D047/37 GRAETZ HR 6144
D047/37 INGELEN HR 6144
D047/37 INTERFUNK HR 6144
D047/37 NOKIA - ITT HR 6144
D047/37 QUELLE HR 6144
D049/37 FERGUSON-THORN-EMI HR 6150
D049/37 GRAETZ HR 6150
D049/37 INTERFUNK HR 6150
D049/37 NOKIA - ITT HR 6150
D049/37 PIONEER HR 6150
D050/37 AKAI HR 6057
D050/37 FERGUSON-THORN-EMI HR 6057
D050/37 GRAETZ HR 6057
D050/37 INGELEN HR 6057
D050/37 INTERFUNK HR 6057
D050/37 META HR 6057
D050/37 NOKIA - ITT HR 6057
D050/37 QUELLE HR 6057
D050/37 SALORA HR 6057
D050/37 SCHAUB-LORENZ HR 6057
D052/37 DREAN HR 6060
D052/37 ENIE HR 6060
D052/37 FERGUSON-THORN-EMI HR 6060
D052/37 FUEGUINO HR 6060
D052/37 GRAETZ HR 6060
D052/37 GRANADA HR 6060
D052/37 INGELEN HR 6060
D052/37 INTERFUNK HR 6060
D052/37 META HR 6060
D052/37 NOKIA - ITT HR 6060
D052/37 SALORA HR 6060
D052/37 SCHAUB-LORENZ HR 6060
D053/37 AKAI HR 6181
D053/37 GRAETZ HR 6181
D053/37 NOKIA - ITT HR 6181
D053/37 REDIFFUSION HR 6181
D056/37 AKAI HR 6182
D056/37 GRAETZ HR 6182
D056/37 IKAI HR 6182
D056/37 INTERFUNK HR 6182
D056/37 LUXOR HR 6182
D056/37 NOKIA - ITT HR 6182
D056/37 OCEANIC HR 6182
D056/37 QUELLE HR 6182
D056/37 REDIFFUSION HR 6182
D056/37 SALORA HR 6182
D056/37 SCHAUB-LORENZ HR 6182
D059/37 AKAI HR 6157
D059/37 ELTA HR 6157
D059/37 FERGUSON-THORN-EMI HR 6157
D059/37 GRAETZ HR 6157
D059/37 INGELEN HR 6157
D059/37 INTERFUNK HR 6157
D059/37 LUXOR HR 6157
D059/37 META HR 6157
D059/37 NOKIA - ITT HR 6157
D059/37 PROFEX HR 6157
D059/37 QUELLE HR 6157
D059/37 SALORA HR 6157
D059/37 SCHAUB-LORENZ HR 6157
D059/37 SKANTIC HR 6157
D060/37 NIXDORF HR 6388
D060/37 NOKIA - ITT HR 6388
D063/37 GRAETZ HR 6293
D063/37 HANSEATIC HR 6293
D063/37 NOKIA - ITT HR 6293
D063/37 OTTO-VERSAND HR 6293
D064/37 AKAI HR 6284
D064/37 GRAETZ HR 6284
D064/37 INTERFUNK HR 6284
D064/37 LUXOR HR 6284
D064/37 NOKIA - ITT HR 6284
D064/37 OCEANIC HR 6284
D064/37 SALORA HR 6284
D066/37 GRAETZ HR 6149
D066/37 INGELEN HR 6149
D066/37 META HR 6149
D066/37 NOKIA - ITT HR 6149
D066/37 SCHAUB-LORENZ HR 6149
D069/37 AKAI HR 6182
D069/37 GRAETZ HR 6182
D069/37 INTERFUNK HR 6182
D069/37 LUXOR HR 6182
D069/37 NOKIA - ITT HR 6182
D069/37 OCEANIC HR 6182
D069/37 QUELLE HR 6182
D069/37 REDIFFUSION HR 6182
D069/37 SALORA HR 6182
D069/37 SCHAUB-LORENZ HR 6182
D070/37 AKAI HR 6160
D070/37 GRAETZ HR 6160
D070/37 INTERFUNK HR 6160
D070/37 LUXOR HR 6160
D070/37 NOKIA - ITT HR 6160
D070/37 OTTO-VERSAND HR 6160
D070/37 PANASONIC - MATSUSHITA HR 6160
D070/37 PIONEER HR 6160
D070/37 SALORA HR 6160
D070/37 SCHAUB-LORENZ HR 6160
D070/37 SKANTIC HR 6160
D071/37 GRAETZ HR 6160
D071/37 INTERFUNK HR 6160
D071/37 LUXOR HR 6160
D071/37 NOKIA - ITT HR 6160
D071/37 OTTO-VERSAND HR 6160
D071/37 PIONEER HR 6160
D071/37 SALORA HR 6160
D071/37 SKANTIC HR 6160
D076/37 AKAI HR 6175
D076/37 GRAETZ HR 6175
D076/37 GRUNDIG HR 6175
D076/37 INTERFUNK HR 6175
D076/37 NOKIA - ITT HR 6175
D076/37 NORDMENDE HR 6175
D076/37 OTTO-VERSAND HR 6175
D076/37 SALORA HR 6175
D076/37 SCHAUB-LORENZ HR 6175
D081/37 AKAI HR 6159
D081/37 BAUR HR 6159
D081/37 GRAETZ HR 6159
D081/37 INTERFUNK HR 6159
D081/37 LUXOR HR 6159
D081/37 NOKIA - ITT HR 6159
D081/37 PIONEER HR 6159
D081/37 SALORA HR 6159
D081/37 SCHAUB-LORENZ HR 6159
D081/37 SKANTIC HR 6159
D108/37 BAUR HR 6100
D108/37 FALCON HR 6100
D108/37 FERGUSON-THORN-EMI HR 6100
D108/37 LOEWE / LOEWE-OPTA HR 6100
D108/37 META HR 6100
D108/37 MITSUBISHI HR 6100
D108/37 MTC HR 6100
D108/37 NECKERMANN HR 6100
D108/37 NOKIA - ITT HR 6100
D108/37 OTTO-VERSAND HR 6100
D108/37 PALLADIUM HR 6100
D108/37 QUELLE HR 6100
D108/37 UHER HR 6100
D118/37 NOKIA - ITT HR 6100
D1669 VARIOS FABRICANTES HRT 202
D171 HIGH VOLTAGE MODULES HRT 225 BP
D174 HIGH VOLTAGE MODULES HR 1681 S
D175 HIGH VOLTAGE MODULES HR 1674 S
D176 HIGH VOLTAGE MODULES HR 1674 S
D177 HIGH VOLTAGE MODULES HRT 901
D178 HIGH VOLTAGE MODULES HRT 906
D202/37 NOKIA - ITT HR 6043
D202/37 NORDMENDE HR 6043
D207/37 MIVAR HR 6268
D207/37 NOKIA - ITT HR 6268
D208/37 NOKIA - ITT HR 6155
D208/37 NORDMENDE HR 6155
D210/37 BRION VEGA HR 6288
D210/37 ELCIT HR 6288
D210/37 NOKIA - ITT HR 6288
D210/37 PHOENIX HR 6288
D214/37 FORMENTI - ADMIRAL HR 6044
D214/37 GELOSO HR 6044
D214/37 LOEWE / LOEWE-OPTA HR 6044
D214/37 NAONIS HR 6044
D214/37 NOKIA - ITT HR 6044
D214/37 REX HR 6044
D214/37 SELECO HR 6044
D214/37 STERN HR 6044
D214/37 ZANUSSI HR 6044
D218/37 FALCON HR 6169
D218/37 LIESENKЩTTER HR 6169
D218/37 LOEWE / LOEWE-OPTA HR 6169
D218/37 META HR 6169
D218/37 NOKIA - ITT HR 6169
D219/37 NOKIA - ITT HR 6172
D233/37 ELBE HR 6025
D233/37 NOKIA - ITT HR 6025
D237/37 LUXOR HR 6174
D237/37 NOKIA - ITT HR 6174
D237/37 SALORA HR 6174
D237/37 SKANTIC HR 6174
D240/37 ELCIT HR 6224
D240/37 MAGNADYNE HR 6224
D240/37 NOKIA - ITT HR 6224
D240/37 RADIOMARELLI HR 6224
D240/37 SHARP HR 6224
D241/37 NOKIA - ITT HR 6223
D241/37 OTTO-VERSAND HR 6223
D241/37 SHARP HR 6223
D243/37 ELCIT HR 6252
D243/37 MAGNADYNE HR 6252
D243/37 NOKIA - ITT HR 6252
D243/37 RADIOMARELLI HR 6252
D243/37 SINGER HR 6252
D244/37 NOKIA - ITT HR 6167
D244/37 OTTO-VERSAND HR 6167
D244/37 SHARP HR 6167
D246/37 FERGUSON-THORN-EMI HR 6119
D246/37 LUXOR HR 6119
D246/37 META HR 6119
D246/37 NOKIA - ITT HR 6119
D246/37 SALORA HR 6119
D246/37 SKANTIC HR 6119
D247/37 ELBE HR 6004
D247/37 NOKIA - ITT HR 6004
D258/37 AUTOVOX HR 6039
D258/37 EXPERT HR 6039
D258/37 NAONIS HR 6039
D258/37 NOKIA - ITT HR 6039
D258/37 REX HR 6039
D258/37 SELECO HR 6039
D258/37 STERN HR 6039
D258/37 ZANUSSI HR 6039
D260/37 HANTAREX HR 6255
D260/37 NOKIA - ITT HR 6255
D272/37 NOKIA - ITT HR 6278
D272/37 ORION HR 6278
D275/37 CASCAIS HR 6132
D275/37 GRAETZ HR 6132
D275/37 NOKIA - ITT HR 6132
D275/37 PHILCO HR 6132
D275/37 SCHAUB-LORENZ HR 6132
D278/37 ELBE HR 6008
D278/37 NOKIA - ITT HR 6008
D278/37 SONITEL HR 6008
D280/37 LOEWE / LOEWE-OPTA HR 6063
D280/37 META HR 6063
D280/37 NOKIA - ITT HR 6063
D280/37 OTTO-VERSAND HR 6063
D280/37 QUELLE HR 6063
D281/37 MIVAR HR 6053
D281/37 NOKIA - ITT HR 6053
D284/37 NOKIA - ITT HR 6090
D291/37 NOKIA - ITT HR 6207
D297/37 MIVAR HR 6254
D297/37 NOKIA - ITT HR 6254
D299/37 MAGNADYNE HR 6153
D299/37 NOKIA - ITT HR 6153
D299/37 RADIOMARELLI HR 6153
D307/37 MIVAR HR 6257
D307/37 NOKIA - ITT HR 6257
D313/37 NOKIA - ITT HR 6119
D322/37 ELBE HR 6134
D322/37 NOKIA - ITT HR 6134
D331/37 ANEX HR 6228
D331/37 FORMENTI - ADMIRAL HR 6228
D331/37 HANTAREX HR 6228
D331/37 IMPERIAL HR 6228
D331/37 NIKKAI HR 6228
D331/37 NOKIA - ITT HR 6228
D331/37 PERDIO HR 6228
D331/37 QUELLE HR 6228
D331/37 SCHAUB-LORENZ HR 6228
D331/37 SELECO HR 6228
D331/37 SIEMENS HR 6228
D335/37 C.G.E. HR 6063
D335/37 FERGUSON-THORN-EMI HR 6063
D335/37 LOEWE / LOEWE-OPTA HR 6063
D335/37 NOKIA - ITT HR 6063
D339/37 NOKIA - ITT HR 6132
D341/37 NOKIA - ITT HR 6253
D341/37 OTTO-VERSAND HR 6253
D341/37 SHARP HR 6253
D342/37 CONTEC HR 6294
D342/37 METZ HR 6294
D342/37 NEC HR 6294
D342/37 NOKIA - ITT HR 6294
D344/37 NOKIA - ITT HR 6256
D344/37 OTTO-VERSAND HR 6256
D344/37 SHARP HR 6256
D348/37 NOKIA - ITT HR 6475
D348/37 OTTO-VERSAND HR 6475
D348/37 SHARP HR 6475
D358/37 BRION VEGA HR 6387
D358/37 NOKIA - ITT HR 6387
D372/37 NOKIA - ITT HR 6278
D376/37 NOKIA - ITT HR 6195
D376/37 SANYO HR 6195
D397/37 JACKSON HR 6295
D397/37 NOKIA - ITT HR 6295
D399/37 NOKIA - ITT HR 6389
D399/37 ORION HR 6389
D-5 FEG HRT 256
D-5B FEG HRT 257
D-6 FEG HRT 262
D92943-A7154-M211 SIEMENS HRT 228 BP
DA019E ORION HR 3533
DCF-1551 AIKO HR 6375
DCF-1551 DAEWOO HR 6375
DCF-1551 DAYTRON HR 6375
DCF-1551 GELOSO HR 6375
DCF-1551 GOLDEN WAY HR 6375
DCF-1551 ITC HR 6375
DCF-1551 NEC HR 6375
DCF-1551 PORTLAND HR 6375
DCF-1551 SHANGHAI SHENG-CHANG-TIAN HUA HR 6375
DCF-1551 SHARP HR 6375
DCF-1551 SHIRO HR 6375
DCF-1551A DAEWOO HR 6375
DCF-1551A MITSUBISHI HR 6375
DCF-1551A TALENT HR 6375
DCF-1551M7103P GELOSO HR 6375
DCF-1551P DAEWOO HR 6375
DCF-1551P G.B.C. HR 6375
DCF-1551P GELOSO HR 6375
DCF-1551P HYPER HR 6375
DCF-1551P LENOIR HR 6375
DCF-1551P TALENT HR 6375
DCF-1577 CONTEC HR 7494
DCF-1577 DAEWOO HR 7494
DCF-1577 DEWO HR 7494
DCF-1577 JINDONG HR 7494
DCF-1577 SHANGHAI SHENG-CHANG-TIAN HUA HR 7494
DCF-1577A ALBA HR 7456
DCF-1577A ASORA HR 7456
DCF-1577A BROOKSONIC HR 7456
DCF-1577A BUSH-MURPHY-RANK HR 7456
DCF-1577A CCE HR 7456
DCF-1577A CGM HR 7456
DCF-1577A CONTEC HR 7456
DCF-1577A DAEWOO HR 7456
DCF-1577A DAYTRON HR 7456
DCF-1577A DEWO HR 7456
DCF-1577A FIRST LINE HR 7456
DCF-1577A G.B.C. HR 7456
DCF-1577A GALERIA HR 7456
DCF-1577A GELOSO HR 7456
DCF-1577A GOLDEN WAY HR 7456
DCF-1577A GOLDSTAR - LG HR 7456
DCF-1577A GOODMANS HR 7456
DCF-1577A HANSEATIC HR 7456
DCF-1577A HCM HR 7456
DCF-1577A HYUNDAI HR 7456
DCF-1577A LENOIR HR 7456
DCF-1577A MATSUI HR 7456
DCF-1577A MITSUBISHI HR 7456
DCF-1577A ONCEAS HR 7456
DCF-1577A OTTO-VERSAND HR 7456
DCF-1577A PAXAN HR 7456
DCF-1577A PORTLAND HR 7456
DCF-1577A PROFEX HR 7456
DCF-1577A PROFILO HR 7456
DCF-1577A ROYAL HR 7456
DCF-1577A SABA HR 7456
DCF-1577A SANYO HR 7456
DCF-1577A SCHNEIDER HR 7456
DCF-1577A SHANGHAI SHENG-CHANG-TIAN HUA HR 7456
DCF-1577A TEC HR 7456
DCF-1577A TELEFUNKEN HR 7456
DCF-1577A TELETON HR 7456
DCF-1577A TELRA HR 7456
DCF-1577A TEMPEST HR 7456
DCF-1577A TENSAI HR 7456
DCF-1577A TOSHIBA HR 7456
DCF-1577N AIKO HR 7482
DCF-1577N ALBA HR 7482
DCF-1577N BUSH-MURPHY-RANK HR 7482
DCF-1577N DAEWOO HR 7482
DCF-1577N FENNER HR 7482
DCF-1577N MITSUBISHI HR 7482
DCF-1577N NEC HR 7482
DCF-1580 AMSTRAD HR 46045
DCF-1580 COMMODORE HR 46045
DCF-1580 DAEWOO HR 46045
DCF-1580 FACIT HR 46045
DCF-1580 IBM HR 46045
DCF-1580 LEADING EDGE HR 46045
DCF-1580 MICROQ HR 46045
DCF-1580 PREMIER HR 46045
DCF-1580 TANDON HR 46045
DCF-1580 TANGENS HR 46045
DCF-1580 TATUNG HR 46045
DCF-1580 TCE HR 46045
DCF-1580 VIDEOCOMPO HR 46045
DCF-1580 VTC HR 46045
DCF-1580B COMMODORE HR 46025
DCF-1580B DAEWOO HR 46025
DCF-1580E AMSTRAD HR 46045
DCF-1580E DAEWOO HR 46045
DCF-1580E IBM HR 46045
DCF-1580E TANDON HR 46045
DCF-1580E TANGENS HR 46045
DCF-2052 AIKO HR 6385
DCF-2052 BRIGHTON HR 6385
DCF-2052 DAEWOO HR 6385
DCF-2052 DAYTRON HR 6385
DCF-2052 DEWO HR 6385
DCF-2052 NEC HR 6385
DCF-2052 PORTLAND HR 6385
DCF-2052 SANYO HR 6385
DCF-2052 SHIRO HR 6385
DCF-2052 TEMPEST HR 6385
DCF-2052A AIKO HR 6385
DCF-2052A BRIGHTON HR 6385
DCF-2052A DAEWOO HR 6385
DCF-2052A DEWO HR 6385
DCF-2052P DAEWOO HR 6385
DCF-2052P DAN NI HR 6385
DCF-2052P G.B.C. HR 6385
DCF-2052P GELOSO HR 6385
DCF-2052P MITSUBISHI HR 6385
DCF-2052P PORTLAND HR 6385
DCF-2052P PROFILO HR 6385
DCF-2052P TELRA HR 6385
DCF-2052P YELLOW RIVER HR 6385
DCF-2077 DAEWOO HR 7481
DCF-2077A ADYSON HR 7455
DCF-2077A ALBA HR 7455
DCF-2077A AUDIOTON HR 7455
DCF-2077A AURORA HR 7455
DCF-2077A BAUR HR 7455
DCF-2077A BUSH-MURPHY-RANK HR 7455
DCF-2077A CAMACROWN HR 7455
DCF-2077A CCE HR 7455
DCF-2077A CGM HR 7455
DCF-2077A CIE HR 7455
DCF-2077A CONDOR HR 7455
DCF-2077A CROWN HR 7455
DCF-2077A DAEWOO HR 7455
DCF-2077A DAYTRON HR 7455
DCF-2077A DEWO HR 7455
DCF-2077A DUBRAVKINJA HR 7455
DCF-2077A ELTA HR 7455
DCF-2077A FIRST LINE HR 7455
DCF-2077A FUJITSU GENERAL HR 7455
DCF-2077A G.B.C. HR 7455
DCF-2077A GELOSO HR 7455
DCF-2077A GENERAL HR 7455
DCF-2077A GOLDEN WAY HR 7455
DCF-2077A GOLDSTAR - LG HR 7455
DCF-2077A GOODMANS HR 7455
DCF-2077A HCM HR 7455
DCF-2077A KIREY HR 7455
DCF-2077A LENOIR HR 7455
Television and monitor flyback transformer pinout have some common designed except that the monitor flyback have a internal capacitor built in. The internal capacitor value have around 2.7 nanofarad to 4.5 nanofarad to improve the picture quality especially when the monitor which can go for a higher resolution compare to Tv. If without the internal capacitor in the monitor flyback the display will curve or slightly out of shape especially at both the right and left hand side of the picture and may present other imperfections not admitted for monitors. It acts as a filter. Internally they may have a high vealue resitor (600 to 900 mega ohm) in parallel to HV output. This to adapt the ouput impedance of the LOPT to the CRT Anode.
Mostly tv and monitor flyback transformers have about ten pins at the bottom of the flyback. Each of the pin have a purpose or function as part of a complete circuit. The common pins that you can find in monitor flyback are: B+ pin, Horizontal collector pulse, ABL (automatic blanking limiter), GROUND, G1, AFC (automatic frequency control), VCC, HEATER (to filament) and X-RAY protection.
The B+ and horizontal collector pulse pin forms one winding which we call it as flyback primary winding. It can only can be test by using a flyback meter such as the Lopt tester flyback transformer pinoutor sencore LC102 and LC103C.
Note that some monitors and TV design may have a separate HV and deflections circuits
.
Normal meters can't check this kind of fault. This is the most important winding compares to others and it can easily developed a short circuit when B+ voltage line or Horizontal output transistor (HOT) shorted. Sometimes a shorted internal capacitor in the flyback transformer may cause the primary winding to burn internally and the flyback became bulge and poured out the epoxy.
Other pins are the ground, G1, and AFC winding. AFC stand for automatic frequency control and it send signal (pulse) from the flyback transformer to the horizontal oscillator ic to lock or synchronize the frequency of the monitor. If this AFC line fails the picture will shift either to the far left or far right. There is no way that you can adjust the picture to the center even with the internal adjustment in the mainboard. The purpose of G1 voltage is to pull the electron generated from the cathode (after the heater or filament heat up) and passed it to G2 which is the screen voltage.
G1 normally is a negative voltage or positive from few volts to 32 volts in some most ancient designs . Most tv picture tube do not use G1 voltage. If the G1 voltage is missing or zero voltage to the picture tube the monitor display will becomes very bright with retrace lines (diagonal lines or flyback lines) across the screen and sometimes the monitor will goes into shutdown mode.
ABL stand for automatic beam limiter- I refer it as a limiter further circuit. Why? because whenever there is a contrast or bright problem i will search for this pin and begin to trace from there. Normally a resistor increased in resistance and a shorted ceramic capacitor caused the display to become dim and you may think it might be the fault of a bad CRT.
Heater or filament pin nowadays hardly found in monitor flyback because the crt heater voltage now is derived directly from the switch mode power supply. However heater pin is still can be found in television flyback transformer. If the anode voltage is too high (more than 30 kilovolt), the x-ray protect pin will send a signal to horizontal oscillator ic in order to disable the horizontal drive waveform THIS FOR SAFETY REASONS.
Without the horizontal drive pulse the high voltage generated by the flyback will collapsed and protect the user from excessive x-ray.
The flyback transformer pinout will also generate high pulse ac which later convert to dc through an ultra fast recovery diode. For your information, the ac pulse generated by the flyback transformer cannot be check with our normal analog or digital meter. the frequency is so high and you need a special meter to do the job. The dc voltages are then supply to various circuit such as the vertical output circuit. If you understand all the functions of each flyback transformer pinout, repairing monitor or tv will be much easier and save your precious time.
TV / MONITOR Fly-Back Transformer Replacement GUIDE:
All repairers with experience, once made a replacement of a driver transformer with more or less fortune. All we did was to methodize the work and modify the circuit to work optimally.
But....... when it comes to a fly-back Transformer , practically all repairers think that if the replacement is not the exact fly-back Transformer, absolutely nothing can be done. In principle we would like to clarify that manufacturers of replacement fly-backs do not manufacture all fly-back Transformer variants; they only manufacture some of them and then connect the bases according to the different models and mark them with a different code. ANYWAY SPECIFICITY IS OEM RELATED BY DESIGN.
EXAMPLE:Between different 20" fly-backs Transformer , for example, there are usually minimal differences except in the position of the legs. If there are notable differences, it is in the high voltage because this varies according to the size of the screen. The 14" tubes usually have extra high tensions of 18 to 20 KV; the 20" tubes between 23 and 25 KV and finally the 29 and 33" tubes have tensions higher than 28 KV / 36KV. In addition, the larger tubes have a different horizontal output circuit that has an east/west modulator to correct the pad effect plus other specific parts.
Let's limit our analysis to 14 and 20" TVs from which the fly-back Transformer is not achieved. The first step is to know a fly-back inside to understand the replacement work. Let's analyze the returns and live of the auxiliary windings.
CHECK schematic diagram and study it.
A modern fly-back Transformer is a hybrid of a high and low voltage transformer and a screen voltage and focus adjustment circuit. It can be divided for analysis into a transformer and a focus pack.
NOTE: fly-back Transformer IS SPECIFIC TO TV / MONITOR CHASSIS BY DESIGN, TAKE ALWAYS ORIGINAL OEM OR ORIGINAL MATCHED REPLACEMENTS.
Transformer analysis:
The transformer is fundamental part of the horizontal output circuit because it connects the source to the collector of the horizontal output transistor through an inductance about 4 times greater than that of the yoke. In this way, only 1.5 to 1.7 A of the 6 or 7 A peak-to-peak current through the yoke flows through the fly-back and the horizontal source capacitor. Be aware that in older tvs which may have greater deflection systems the currents are higher.
But the fly-back is not an inductor, it is a transformer and part of the energy existing in its primary is transformed into several low voltage windings, which feed different stages of the TV such as the jungle, the vertical output, the video stage , the sound, key voltages for chroma, sync, and many others services depending on design, and above all the tube filament (which is not rectified but applied as AC). These windings are strongly coupled to the primary because they are built above or below it.
The geometry of the fly-back core is very particular because it is a transformer that has a high voltage winding and the turns of that winding must be away from the core. Therefore, the classic shape of the core with an "E" and "I" shape is abandoned and a shape with two "U"'s is used where the HV winding enters loosely. The spool of that winding has a slotted shape, where only the diameter of a wire enters. In this way the winding is really a wire spiral and in reality it is not one single winding but 4 or many more , each one with its corresponding high voltage diode and its filtering capacitor, also of high voltage. This winding, because of its shape, is loosely coupled to the primary so that a fault in it, is not transferred as a short circuit but as a reduction of primary inductance but it will produce a malfunction.
As we know, the return of the high voltage winding is not connected to ground, but to the horizontal source. A 20" tube supports only a maximum current for each cathode of 330 uA; between the three cathodes they can consume a maximum of 1 mA and that current is directed from the cathodes to the aluminizing of the screen that is part of the final anode of the tube. This current returns through the winding and produces a voltage drop in a network
Synthetically, if the image is black there is no current and the voltage of ABL When the brightness increases, the voltage increases so that when 1 mA circulates, the voltage is cancelled and there operates the jungle / luminance matrix stages limiting the brightness and contrast.
Analysis of the focus / G2 VOLT pack inside DST Transformer
Flyback deflection systems are well known and widely used in television receivers. In such systems, a deflection voltage source drives an autotransformer with a ramp shaped current for deflecting an electron beam across the phosphor coated faceplate of a cathode ray tube (CRT). At the end of the ramp waveform, a relatively large retrace pulse is developed. This pulse is magnified by the turns of the flyback transformer winding and rectified to develop the high DC voltage required to operate the CRT. As is well known, although the high voltage system is tuned, the high DC voltage produced varies substantially with system loading that occurs due to increases in the electron beam current of the CRT. There have been numerous circuits in the art for "stiffening" the high voltage supply. In many applications, a separate, non-deflection-based high voltage system is used because of its tighter tolerance on regulation.
With the growing use of computer
monitors, the need for precision CRT displays has increased. In these
uses, high voltage regulation is critical and needs to be closely
controlled to prevent unacceptable raster distortion and size changes.
On the other hand, the needs of the marketplace are such that the cost
of the monitor must be maintained as low as possible.
The focus pack has several functions: it is a double variable voltage attenuator also known as HV Bleeder. The highest voltage is for the focus and the lowest for the screen. The older tubes are low focus and the focus pack delivers voltages of approximately 8 KV. The newer and bigger ones are high focus and deliver about 9.5 KV. It is not possible to change a low-focus fly-back for a high-focus one, because it does not adjust the focus.
Generally, the conventional bleeder resistor is manufactured in the following manner. , there is prepared a ceramic substrate made of Al2 O3 having a purity of about 96%. Its thickness is about 0.5-1.2 mm, and its area is 400-1500 mm2. Upon the ceramic substrate , there is printed PbAg, PtAg, Ag or their combination paste. Then the printed substrate is baked at a temperature of about 800° C., and thus, a printed circuit board is formed, and then lead wires are soldered. Then RuO2 is printed thereupon, and then the structure is baked at a temperature of about 850° C. Thus a resistor having a certain thickness is completed.
Meanwhile, in this resistor, electric current can flow only if the electrical resistance per unit length of the resistor is smaller than the air contact electrical resistivity. In the case where the voltage breakdown resistivity of air is 0.5 KV/mm, if a voltage of 20 KV is supplied across a resistor 12, there has to be secured a distance of 20 KV÷0.5 KV/mm=40 mm. Further, if the thermal degradation and the environmental factors are taken into account, then the safe distance must be 1.8 times as large as the above distance, that is, 40 mm×1.8=72 mm. Meanwhile, in the case where the resistor 12 is printed on the ceramic substrate 10 in a straight line, the length of the ceramic substrate has to be longer, with the result that the total bulk of the ceramic substrate becomes too large.
The screen voltage is approximately the same for all tubes (in the order of 250 to 350V or 500 to 800V). Both voltages are provided by voltage dividers and high value potentiometers because they are directed to grids in the tube that do not consume current. As you can see, the circuit is simply a series of two high voltage potentiometers and two high voltage resistors connected between the pacifier output and ground. In figure above I draw the focus pack circuit only with the characteristic voltages and resistances, which are practically the same (or at least proportional) for all the equipment.
The resistance values are high enough that it is impossible to measure them with a digital or analog tester. It is even impossible to measure the voltages at the focus and screen outputs without altering their value. And they're prone to defects such rising in values or dropping value.
Now that we know the circuit let's start with the replacement work. As the fly-back has two sections we must analyze the failures of both sections separately starting with the fly-backs that have problems in the focus pack.
The most common fault is a dark screen despite the existence of high voltage. A high voltage tip should really be used for the tester if we want to be sure of the existence of the 25KV of AT but generally the test of measuring the screen voltage with the potentiometer at maximum is usually enough to verify that there is high voltage.
The ideal is to use the focus pack of a disused fly-back Transformer set on a 20" TV that works well to indicate 250V on the screen output by adjusting the potentiometer. Without much error you can interpret that this test TV is 25 KV and already has a high voltage attenuator set that you must connect to the pacifier of the TV under test with an alligator clip that will be covered by the pacifier so that no arcs are produced.
If there is good high voltage and the screen is dark the problem may not be in the fly-back Transformer. The most basic thing is to see if the tube filament is on and measure the screen voltage if you have not already measured it. If both things are OK, you should measure the focus voltage, with a high voltage tip that has a resistance greater than 200 MOhms.
The measurement with instruments is not dangerous for the circuit, because the focus source is of high impedance.
At the time when indicated to connect the three cathodes to earth briefly with resistors of 150KOhms and to return to test if the screen illuminates the problem is in the video card or the jungle.
But if the problem is in the focus pack you don't need to change the whole fly back. Transformer In specialized stores they sell focus packs ready to be connected to the pacifier that generate the focus and screen voltage. Cut the cables of the damaged focus pack, connect the new ones and test. You can also use a fly-back that has a damaged winding. This case is specific with external HT bleeders where the focus voltage is obtained from.
If the problem is in the winding section of the fly-back Transformer the first thing to do is to check the operation of the stage with the simulated fly-back instrument. Connect it replacing the primary and measure the collector oscillogram with low source voltage (for example 10% of the nominal value); if you do not have an oscilloscope, try it with the horizontal output detector (a RF detector probe) which can be lowered free of charge from and if the delay voltage has a normal value of about 80V, pass gradually to higher source values until the nominal value is reached.
If everything is normal, try connecting only the primary of the fly-back Transformer supposedly damaged. This means that you must disconnect all the auxiliary diodes, including the HV pacifier, and try again, starting with a source voltage of 10% of the nominal value, until you reach 100%. If everything is OK, the problem is not in the fly-back Transformer but in some of the auxiliary circuits. Connect the auxiliary diodes one by one and always perform the same test starting from 10% of the source voltage until the damaged auxiliary circuit is discovered. Note: Although unlikely, consider that there may be more than one damaged auxiliary circuit.
TAKE NOTE THAT THE'RE MAY A SPECIFIC PROTECTIVE TV CIRCUIT THAT WILL STOP THE HORIZONTAL OUTPUT IF IT IS NOT WORKING PROPERLY AND ALSO SOME TV POWER SUPPLY VOLTAGE MAY NOT WORK PROPERLY IF THE HORIZONTAL OUTPUT IS NOT WORKING PROPERLY DUE TO A FLY-BACK TRANSFORMER WHICH MAY BE DEFECTIVE.
AS EXAMPLE:
In a typical switch mode power supply (SMPS) of a television receiver the AC mains supply voltage is coupled, for example, directly, and without using transformer coupling, to a bridge rectifier. An unregulated direct current (DC) input supply voltage is produced that is, for example, referenced to a common conductor, referred to as "hot" ground, and that is conductively isolated from the cold ground conductor. A pulse width modulator controls the duty cycle of a chopper transistor switch that applies the unregulated supply voltage across a primary winding of an isolating flyback transformer. A flyback voltage at a frequency that is determined by the modulator is developed at a secondary winding of the transformer and is rectified to produce a DC output supply voltage such as a voltage B+ that energizes a horizontal deflection circuit of the television receiver. The primary winding of the flyback transformer is, for example, conductively coupled to the hot ground conductor. The secondary winding of the flyback transformer and voltage B+ may be conductively isolated from the hot ground conductor by the hot-cold barrier formed by the transformer.
It may be desirable to synchronize the operation of the chopper transistor to horizontal scanning frequency for preventing the occurrence of an objectionable visual pattern in an image displayed in a display of the television receiver.
It may be further desirable to couple a horizontal synchronizing signal that is referenced to the cold ground to the pulse-width modulator that is referenced to the hot ground such that isolation is maintained.
A synchronized switch mode power supply, embodying an aspect of the invention, includes a transformer having first and second windings. A first switching arrangement is coupled to the first winding for generating a first switching current in the first winding to periodically energize the second winding. A source of a synchronizing input signal at a frequency that is related to a deflection frequency is provided. A second switching arrangement responsive to the input signal and coupled to the second winding periodically applies a low impedance across the energized second winding that by transformer action produces a substantial increase in the first switching current. A periodic first control signal is generated. The increase in the first switching current is sensed to synchronize the first control signal to the input signal. An output supply voltage is generated from an input supply voltage in accordance with the first control signal.
But if everything indicates that the problem is in the fly-back Transformer and the fly-back is not achieved, then we must find a fly-back Transformer as similar as possible (better original) to ours and perform a very simple test. Make a 2 or 3 turns winding in any open place of the core by connecting one end of the winding to ground. If you have an oscilloscope, connect it over the added winding to raise the oscillogram; otherwise, connect the rewind pulse detector indicated above to a tip of the winding and then invert it to find both the positive and negative value of the signal. Connect only the primary of the new fly-back and run it at the nominal voltage.
The oscillogram obtained will be similar to the one in figure:
The oscillogram could appear inverted since we made our coil with any direction. If it appears inverted, change the ground connection to live. The most important thing is that you measure the peak pulse value of the signal, which in our case is 23.8V. If this voltage corresponds to three turns, calculate the value of voltage per turn as 23.8/3 = 7.9 V/turn.
If you don't have an oscilloscope, you can use the audio probe for the tester (A RF detector probe) that will indicate directly the value of the signal or make the double measurement with the delay detector.
Now we have to start modifying the auxiliary voltages of our substitute fly-back Transformer if necessary. Let's start with the filament voltage. Observe the circuit of the substitute fly-back to find the ground leg and connect it to ground. Now measure the other auxiliary legs and note the peak to peak values. The filament should have a peak pulse voltage of about 22 or 23 V. Do not try to measure the RMS voltage with a common tester or with the peak value probe. None of the classic instruments will show a peak pulse value of 6.3V. It is best to calculate the RMS value as a function of the peak-to-peak value for a delay time of 12 uS, which is what we did to indicate the correct peak value of 22.5V.
It is very likely that by changing the number of turns you will not be able to achieve the exact value. In that case you should calculate the excess turns and then adjust the resistor value to get 22.5V on the filament. In our case you can test the voltage value of the filament winding and if it is close to the indicated one modify the value of resistor .
Is it very important that this voltage value is accurate? Yes, but a fluctuation of 1V cannot shorten the life of the tube but it's better avoided. The filament of a tube is far from the melting point, i.e. it is undervolted to increase the life to a value far above the cathode depletion but also better avoided.
Adjusting a Running Auxiliary Voltage
Let's suppose that the winding for the vertical voltage has to give 25V and gives 18. We measure that our fly-back has 7.9 V peaks per turn. For a delay time like the one indicated, the relationship between the positive semicircle and the peak value taken from the oscillogram in figure 30.4.3 is 3,07/23,8=0,13. This means that each turn adds a voltage of 3.67V to the rectified voltage and that to go from 18 to 25 you have to add approximately two turns (7.34V+18 = 25.34V). Without an oscilloscope, I have to add the two turns and measure a voltage of 3.67/0.13= 28.2V with the peak probe. Now, I must cut the printed circuit and connect from the fly-back leg a wire that must pass twice inside the core and solder it to the cut track on the side of the diode.
Note: the direction of the winding is impossible to determine a priori, the most advisable thing to do is to choose any and measure if the voltage has the correct value. If not, the winding or connections must be reversed.
In this way all windings must be corrected, so that the fly-back is ready to perform a final test with everything connected.
But the auxiliary voltages are not all that differentiate one fly-back from another. In the next delivery we will explain how to perform the final test without burning anything in the attempt, and that should be changed if the width is not correct.
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